Well I'm 16 and I'm dating this guy that is 17 about to turn 18 in Jan. If we have been dating will I have to break up with him just because he is about to turn 18.

Well..
Yes. Because technically he is supposed to be 1 year older than you or its called rape.
no. because I think you are old enough to make decisions for yourself and as long as he isn't presuring you to do anything, than that's OK. :)
You decide.
Elke <3